/*
 * Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdlib.h>

#ifndef OPENSSL_ASYNC_H
#define OPENSSL_ASYNC_H
#pragma once

#include <openssl/macros.h>
#ifndef OPENSSL_NO_DEPRECATED_3_0
#define HEADER_ASYNC_H
#endif

#if defined(_WIN32)
#if defined(BASETYPES) || defined(_WINDEF_H)
/* application has to include <windows.h> to use this */
#define OSSL_ASYNC_FD HANDLE
#define OSSL_BAD_ASYNC_FD INVALID_HANDLE_VALUE
#endif
#else
#define OSSL_ASYNC_FD int
#define OSSL_BAD_ASYNC_FD -1
#endif
#include <openssl/asyncerr.h>

#ifdef __cplusplus
extern "C"
{
#endif

    typedef struct async_job_st ASYNC_JOB;
    typedef struct async_wait_ctx_st ASYNC_WAIT_CTX;
    typedef int (*ASYNC_callback_fn)(void *arg);

#define ASYNC_ERR 0
#define ASYNC_NO_JOBS 1
#define ASYNC_PAUSE 2
#define ASYNC_FINISH 3

#define ASYNC_STATUS_UNSUPPORTED 0
#define ASYNC_STATUS_ERR 1
#define ASYNC_STATUS_OK 2
#define ASYNC_STATUS_EAGAIN 3

    int ASYNC_init_thread(size_t max_size, size_t init_size);
    void ASYNC_cleanup_thread(void);

#ifdef OSSL_ASYNC_FD
    ASYNC_WAIT_CTX *ASYNC_WAIT_CTX_new(void);
    void ASYNC_WAIT_CTX_free(ASYNC_WAIT_CTX *ctx);
    int ASYNC_WAIT_CTX_set_wait_fd(ASYNC_WAIT_CTX *ctx, const void *key, OSSL_ASYNC_FD fd,
                                   void *custom_data,
                                   void (*cleanup)(ASYNC_WAIT_CTX *, const void *, OSSL_ASYNC_FD,
                                                   void *));
    int ASYNC_WAIT_CTX_get_fd(ASYNC_WAIT_CTX *ctx, const void *key, OSSL_ASYNC_FD *fd,
                              void **custom_data);
    int ASYNC_WAIT_CTX_get_all_fds(ASYNC_WAIT_CTX *ctx, OSSL_ASYNC_FD *fd, size_t *numfds);
    int ASYNC_WAIT_CTX_get_callback(ASYNC_WAIT_CTX *ctx, ASYNC_callback_fn *callback,
                                    void **callback_arg);
    int ASYNC_WAIT_CTX_set_callback(ASYNC_WAIT_CTX *ctx, ASYNC_callback_fn callback,
                                    void *callback_arg);
    int ASYNC_WAIT_CTX_set_status(ASYNC_WAIT_CTX *ctx, int status);
    int ASYNC_WAIT_CTX_get_status(ASYNC_WAIT_CTX *ctx);
    int ASYNC_WAIT_CTX_get_changed_fds(ASYNC_WAIT_CTX *ctx, OSSL_ASYNC_FD *addfd, size_t *numaddfds,
                                       OSSL_ASYNC_FD *delfd, size_t *numdelfds);
    int ASYNC_WAIT_CTX_clear_fd(ASYNC_WAIT_CTX *ctx, const void *key);
#endif

    int ASYNC_is_capable(void);

    typedef void *(*ASYNC_stack_alloc_fn)(size_t *num);
    typedef void (*ASYNC_stack_free_fn)(void *addr);

    int ASYNC_set_mem_functions(ASYNC_stack_alloc_fn alloc_fn, ASYNC_stack_free_fn free_fn);
    void ASYNC_get_mem_functions(ASYNC_stack_alloc_fn *alloc_fn, ASYNC_stack_free_fn *free_fn);

    int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *ctx, int *ret, int (*func)(void *),
                        void *args, size_t size);
    int ASYNC_pause_job(void);

    ASYNC_JOB *ASYNC_get_current_job(void);
    ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job);
    void ASYNC_block_pause(void);
    void ASYNC_unblock_pause(void);

#ifdef __cplusplus
}
#endif
#endif
